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Rules of the Game A.10 multiple-choice questions + 2 tie-breaker A.~30 seconds per question B.Work in groups of 2 A.Answer sheets 2 sections fill in both hand bottom part to your instructor A.Winning teams in each institute will receive a prize from CERN B.Overall winning team of the day will receive an additional prize from CERN A.But the main aim is to have fun!

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Why do tau and mu leptons decay? A.Because the Standard Model says so B.Because there are lighter particles they can decay to C.Because they interact with the magnetic field of the experiment D.Because there is so much energy produced in e.g. LEP collisions that they break apart Tiebreaker Question 1